Electpvic heating unit ob hot plate



L. R. HAMLIN. ELECTRIC HEATING UNI? 08 HOT PLATE.

APPIJCATIDN FILED APR. .1921.

Patented Nov. 21, 1922.

Patented Nov. 21, 1922.

UNITED STATES LOUIS E. HAMLIN, OI EOE-M0, INDIANA,

ASSIG-HOB 1'0 THE GLOBE STDVE 6a RANGE comm, or xoxonro, IH'DIANLELECTRIC HEATINGUNIT 0B HOT PLATE.

- s lieenonuieu Toall whomitnwycorwgrms j Be it known that I LornsR.HAKDIN a" citmen of the United tetes, rcsidin at okomo, Howard (County,Stateof diaLns,

a have invented certain new and useful Impg'ovements in Electric Units'or Hot lates, of which the follewing'iss, specification. 2 1.

This invention relates to improvements in electric heating nnitsorholgp'vletes. f

- The main 0b100l3- off this-invention are:

First," toprqvide an improved' electric heating unit'or hot pl ute in'which the grooves for the heati' coil as to elfectivelyretain el'reetingcoils- Second, to provide an improved heating unit or hot plate in whichends of the coils ily connected. Third,

plate for heating units;

liurther' objects, and structural details, defimtely appear m thedetailed description to follow.

I accomplish the objects of my 1nvention by the device and meansdescribed 111 the following ecificationil The invention is clearly denod and pointed out ui'th'e claims. A structure which is a preferredembodiment of my invention is clearly illustrated in the accompanyingdrawing, forming a part of this sp cation, in which;

Fig, I is a, top view of my improyed heating unit, portions only of thecoils being 85 shown.

Fi I1 is a. vertical section on a. line comspon g to the broken line 2-2of Fig. I. In the drawing similar reference-characters refer to similarparts throughout the 40 several views.

Referring to plate 1 is formed commonly of pores] the drawing, theinsulating of suitable insulating matens-l, ein. The plate has aplurality of zig-zagged coil ves m 5 its face, the plate illustratedhaving two grooves. The outward and return reaches of the outer grooveare designated by the numerals 2 and 3, respectively. grooves aretapered outwardly, that is, they so are wider at the top than at thebottom.

The outward and return reaches of the outer coil groove are in thestrueturp illustmted concentrically disposed. The outward and returnreaches 4 and 5, respec- I56 tively, of the inner coil grooves eachcomthe coils drawingthe moves and before sjcre soformed R of the centerwall of ner coil 11 is laid in the inner coil groove, the-terrnhials or'areso disposed as to beireedto provide en improved insulating d sasterto the grooves so that they are held April 11,1921. serial No. 460,588.

prise e plurality of segmental loops disposed oppositely of the center 6of the plate.

' At the ends of the grooves the plate is pr vided with holes 7 for thebinding posts 8. The ends 9 of the grooved walls around -which the coilsare looped ere undercut as shown in Fig. II to prevent the tension onthem out of the grooves, particularly when the coils are first laid inthe current has been 1edthereto.'-

he outer coil 10 is laid in the outer and teaches? and 3 of theoutergroove withf ts'bight engaging the undercut end 9 these grooves.The in which as stated,comprises the outer and return reaches eachformed of a plurality of segmental 100 s, and engages with theundercut-ends o the center wells of the loops of this inner groove sothat it is likewise efi'ectively retained. 4

The angles forming the '/,i lugs-in the groo'vesere disposed in radial ninement, the coils are'strtched slightly when placed in in bindingengagement with the angles formed by the ziii'zeug. When heated andcooled. the coils ta e permanent set conforming to the grooves and areheld therein without other securing means than that provided by thezigzegd grooves and the undercut ends describe The ends of the coils areprovided with clips 12 which are engaged i ts.

fih g coils mav be easily removed if desired and new coils positioned byan unskilled person.

My improved hot plate is very economical to produce as it may be readilymolded, is not likely to be broken and the coils may he quickly placedtherein and are effectively retained as stated without attaching meansother than is provided by the plate itself.

A further advantage of this construction is that by changing the size ofthe wire the plate can be adapted for a. 110 or 220 volt usage. Thearrangement of the reaches of the grooves rovides a plate of largecapacity and the inner coil is of suitable length, being equal to orgreater in length then the outer coil, which is a feature of substantialadvantage My improved heating use in various relations.

with hindunit is desirable for I have not attemptand eachcomprisingnplurality o ed to illustrate the'various adaptations and ingoutward and return reacheseach comapplications thereof, as I believethey will prising e plurality of segmental loops. 40 he understood bythose skilled in the art to 5 An insulating plate for electric heatwhichmyinvention relatesi v ing units having g. zig-zagged coil groove Havingthusde'scribed my invent on, whet comprising outward and return reaches,a I claim as new and desireto secur y coil disposed in said groove andengaged ters Patent, is: with the several angles thereof, the end of 1.In an electric heiltl'lig' unit, he comblthe center wall of the groovesaround which nation of a porcelain lai te'hgllngml er'and the coiluislooped being undercut. i r zig-zagged coi grooves, the enter 6. Aninsulat' 0 plate for electric heating groove comprising outward and reurn units having a zig-zagged coil groove comreaches, the inner-groove"comprising -out-. prisingloutvmrd and return reaches, 9; coil wardend-return reachesidisposed ippositely ydisposedfih,said ,gmovaandengaged with segmem the several'anglesthereof. tal loops, the ends ofthe center walls ofthe- '7.- Air-insular my: plate for electric heatinggrooves arbundwhicli the bights-of the coils: units "having a. pluralityof zi -za ged coil .-enga; e being..undercut. grooves, the ends'ofthewalls oi sai grooves "2. an electric;heating-unit; the comaroundwhich the coils are looped being ungfbination ofi-e porceleinplete-havingouter dercutv Mend inner zig-zeggedmoil grooves,-the outer8. In an electric heating unit, the combigroove com risingconcentrically j disposed nation ofran insulating plate having azigoutward an returnree'che's the mnergrooye zegged coil cm, the wallsof which con comprising outward and return,.-reaches-d1sverge inwar l,--a nd a coil arranged-in said rehty 1n smd'grooves'.

posed.o positely nd=e qheomprisin' a plugroove aroun .the angles of thezig-zags,

' o segmental loopsgia'ndlcoils lsposed all coectingfor the purposespecified.

t v In an-electric heetinp unit, the combi- "3. In an electric-heatingunit, the combi-- nation of an 'insulatingplate having a. zi

-na.tion-of a,- oroeleinl lete hevmg-epluraL-z aged coil igroovej and acoil arranged in ityof zi'g zagged -co grooves @0111 rising sax groovearound the angles ofthe zigoutward and return-reaches, and coils disz'as, ,a.ll coacting for the purpose specified. posed'insaid grooves, theenclsof thegroove n witness whereof I have hereunto set walls aroundwhich the ceils-are-loopedjhe=- my-hand andfseal in the presence of, twoing undercut. .j; witnesses. Y

: 4. An insuletin plate for-heating units R AMLIN [L 8] having a. plumty offlzig-zagged coil grooves, there beinlg sen-outer groove com-Witnesses:

prising concentrica y disposed outward and F. Onrmr,

return reaches and an inner groove compris Ennns'r D. Gena.

